Rainbow Shark – Epalzeorhynchos frenatum

Rainbow Shark – Epalzeorhynchos frenatum

Bold, active, and full of color, the Rainbow Shark (Epalzeorhynchos frenatum) is a striking freshwater species known for its jet-black body and vivid red fins. Despite its name, this "shark" is actually a peaceful bottom-dwelling cyprinid that adds energy and contrast to tropical aquariums.

Rainbow Sharks are excellent algae grazers and enjoy exploring caves, driftwood, and smooth substrates. They’re best kept in spacious, well-decorated tanks with good water flow and plenty of hiding places.

Features:

• 🐟 Scientific Name: Epalzeorhynchos frenatum
• 🌎 Origin: Southeast Asia (Thailand, Laos, Cambodia)
• 🌈 Coloration: Deep black body with bright red fins and tail
• 💧 Temperament: Semi-aggressive; territorial toward similar fish
• 🍽️ Diet: Omnivore – algae wafers, pellets, vegetables, and frozen foods
• 🪸 Tank Level: Bottom to mid-level

Recommended Tank Parameters:

• Temperature: 74–80°F
• pH: 6.5–7.5
• KH: 4–12 dKH
• Minimum Tank Size: 40 gallons
• Environment: Spacious tank with caves, rocks, and hiding spots

Behavior & Compatibility:
Rainbow Sharks are territorial toward their own kind and similar species (like Red Tail Sharks). They do best as single specimens or in large aquariums with other active mid-to-top-level fish such as barbs, rainbowfish, danios, and larger tetras. Avoid keeping them with slow-moving or long-finned tankmates.

Frequently Asked Questions (FAQ)

Q: How big do Rainbow Sharks get?
A: Adults reach about 5–6 inches in length.

Q: Are Rainbow Sharks aggressive?
A: They’re semi-aggressive, especially toward similar-looking species. Best kept as a single specimen.

Q: Can they live in a community tank?
A: Yes — they do well with active mid-water fish like barbs, danios, and rainbowfish.

Q: What do Rainbow Sharks eat?
A: They’re omnivores that enjoy algae wafers, sinking pellets, blanched veggies, and frozen foods.

Q: Do Rainbow Sharks clean the tank?
A: They help control algae but should still be fed a balanced diet — they’re not full-time cleaners.